Casing for electrical apparatus



M. L. ELDER.

CASING FOR ELECTRICAL APARATUS.

APPLICATION FILED AUG.2V 5, 1191'9.

Patented Oct. 25, 1921.

Inventor: Matt I'Iew L Elcler,

b5 His Jqttorneng.

UNITED. STATES PATENT. OFFICE.

Assioma ro GENERAL ELEc- NEw Yoax.

CASING FOR ELECTRICAL APPARATUS.

Specification of Letters Patent. I

lsatented Oct. 25, 1921.

Appneation mea August 25,4919. serial No. 319,694.

To all 'whom 'it may concern.'

Be it known that I, MATTHEW L. ELDER, a

citizen of the United States, residing at Pittsfield, in the county ofBerkshire, State of Massachusetts, have invented new and vusefulImprovements in Casings for Elec- .trical Apparatus,

of which the following is a specification.

My invention relates to tanks or casings for electrical apparatus suchas transformers which are provided with means, such as cooling coils,for circulating an auxiliary cooling medium.

In tanks or casings of this character which generally contain oil as theprincipal cooling medium for the electrical apparatus, some difficultyhasl been experienced in making oil tight the joints, where the endsof-the cooling coil pass through the wall of the tank.

Difliculty, too has sometimes been experienced in properly alining theends of the coil with the opening in the wall of the. tank, wheninstalling the coil; and also at times in properly deta'ching the coilwhen it is desired to remove it.

It is the object then of my invention to provide an improvedconstruction which avoids these difficulties. In accomplishing this endI make use of a coupling device for the ends of the coil which isindependently secured to the coil ends and to the tank. Such aconstruction permits the connections for supplying the auxiliary coolingmedium, which is generally water, to be made at a point that is out ofcontact with the body of oil; hence water cannot get into the oil,should a leak develop.

Still further objects and advantages of my invention will appear fromthe following detailed description when taken in connection with theaccompanying drawing in which: Y

Figure 1 shows partly in section and partly in elevation a transformertank having a cooling coil attached in accordance with my invention.Fig. 2 is an enlarged view showing the details of the coupling deviceshown in Fig. 1. Fig. 3 is a perspective view taken from the rearshowing other details of the same coupling device. Fig. 4 is a viewsimilar to Fig. 2 showing a modified form of coupling which may be usedin the practice of my invention. Figs. 5 and 6 show further modifiedforms of couplings.

Referring now to the drawings A10 denotes a tank or casing adapted tohouse electrical apparatus and to contain the principal cooling mediumas, for instance, oil. 11 denotes the cooling coil which is submerged inthe oil, and has circulating through it the auxil- 1ary cooling mediumas, for instance water. The coil 1l has a generally helical form inorder to provide a large cooling surface in the oil and has both itsupper and lower ends provided with couplings protruding through openings12 in the wall of casing l0, which are secured therein in an oil andwater tight manner.

To secure the end couplings of the coil 11 in this desired manner, animproved device of the type shown more in detail in Figs. 2 and 3 isemployed. An elbow l5 is brazed `or otherwise tightly secured to a coilend, as shown at 16.` The other end of the elbow 15 is threaded toreceive the end of an exterior pipe end or nipple, as shown at 17.

The nipple or pipe end 17 has a shoulder 18 formed integrally thereonand supports set screws 19 which force the flanged sleeve 20 to firmlyengage the gasket 21 interposed between it and the threaded end oftheelbow 15. The sleeve 20 fits loosely over the nipple or pipe end 17 sothat any water, which may leak from the joint made by the nipple in theelbow, finds free egress through the annular space between the nippleand sleeve to the exterior of the tank 10 without tending to enter theoil space.

The sleeve 20 has screws 22 in its flange 23 arranged to engage with orscrew into the boss or collar 24 formed or secured on the tank 10 aboutthe openings 12 in a fluid tight manner. The screws 22 draw the flangedsleeve 20 up against the boss 24 tightly so as to compress the gasket 25sufliciently to make an oil tight joint. Any leak at this joint permitsthe oil free egress to exterior of the tank without contact with thewater or auxiliary cooling medium.

In order to prevent the -elbows 15 from turning in openings 12, andhence twisting or straining the coil 11, I preferably provide each elbow15 with proJectlons such as shown at 26 which are adapted to engage incorrespondixw recesses 2T formed in the interior end of boss 24 whensuch elbows are drawn into place.'

It will be observed that the uplper and lower fianged sleeves 20 serveast e means for securing the coil 11 in place; and that when the nipples17 and sleeves 20 have been loosened, the coil 11 is removable. The coll11 is, in consequence, readily secured 1n place or removed withouthavlng first to be alined or to be bent in place.

The lower end of the coil is preferably the inlet for'the water orauxiliary cooling medium and is provided with a three way valve 30 whichserves not only as a means for regulatin the flow of such auxlliarymedium but aIso as a drain therefor. 0 D

The exterior upper end of the'coll 31 1s preferably made the highestportion of the coil and 1s rovided with an air inlet vent 32 so that alAwater may be drained from the coil when desired. The down-turned ortion33, serving as the outlet, is '.provlded with a funnel 34 to catch thesplash where an open discharge system is employed.

In Fig. 4 I have shown another form of coupling which may be used toaccomplish the same result as that shown in Fig. 2. Here the coil end 16is secured in the elbow 35 which is screwthreaded to receive the pipeend or nipple 17. The threaded end of the elbow 35 1s flanged to receivescrews'36 which draw up the wide collar 37 to compress the gasket 38between them. rI`he wide collar 37 fits loosely about the pipe end ornipple 17 so that any leakage of water will have free egress to theexterior of the tank.

The boss or collar 44 formed about the opening in the tank receivesscrews 42, also carried by the wide collar 37 and has compressedtherebetween the gasket 45 so as to prevent leakage of oil. This collarconsequently supports the coil 11 .in the same manner as did the sleeve20 in the previously described construction.

In Fig. 5 I have shown still another cou'- pling which may be used toaccomplish these results in accordance with my invention. Here the coilend 16 is secured in one end of the elbow 55, and in the other end thereis in threaded engagement with the elbow the pipe end or nipple 17 Herea flanged sleeve 60 is slipped over the nipple 17 and in this form issecured in place by an external thread 61 on the elbow 55. Since sleeve60 loosely fits around .y the pipe end 17, any leakage at either ofthese threaded jomts has free-egressto the i exterior of the tank. Theflanged sleeve 60 is drawn up against boss 62, with a -compressed gasket63 intervening, by means of the screws 64; so that the coil 11"'is hereflange 84 on thesleeve 80.

againA supported in substantially the same manner as described inconnection with n Fi 6 I have shown still another form of coup ing foraccomplishing the purpose of my mvention, but differs from thosereviously described principallyin the use o an internal boss on the tankinstead of an ex-l which the threaded end of elbow 75 is drawn tocompress the gasket 82 when brought into place by the set screws 83 suported in the ere again it is seen that any leaka e at the joints hasfree egress to the exterlor of the tank 10.

Having now described what is at present the best means known to me forcarrying out an embodiment of my invention, I would have it understoodthat such means are merely illustrative and that I do not mean tol belimited thereby to the exact details shown nor in the choice ofrecognized equivalents except as defined in my claims hereunto appended.

What I claim as new anddesire to secure by Letters Patent of the UnitedStates, is,-

1. In casings for oil insulated transformers and the like, thecombination with a wall, of a cooling coil adapted to convey a fluid forcooling the oil and provided with end couplings arranged to protrudethrough said wall, and means for securing said end cou lings insaid'wall in a fluid tight manner an arranged to permit free egress ofleakage to the exterior of the casin wallwithout intermingling with theo' 2. In casings for transformers and the like, the combination with awall, of a cooling coil provided with end couplings adapted to protrudethrough said wall, an

exterior portion of said coil bein made the highest part thereof andprovi ed with a vent, and means for securing said end couplings in saidwall in a fluid tight manner.

3. In casings for transformers and the like, the combination with awall, of a cooling coil provided with end couplings adapted to protrudethrough said wall, and means making independent joints with said walland with said end couplings for securing said coil in said tank in ailuid tight I na'nner.-

.4. In 'casings for transformers and the like, the combination with awall, of a cooli"r ig`v .coil provided with end couplings adapted-toprotrude through said wall, an

exterior -"portion of said coil being made the highest kpart thereof andprovided with a vent, the lowest exterior portion being provided with adrain, and means making independent joints with said wall and with saidend couplings for securing said coil in said tank in a fluid tightmanner.

5. In casings for transformers and the like, the combination with awall, of a cooling coil provided withlend couplings adapted to protrudethrough said wall, an exterior portion of said coil being made thehighest part thereof and provided with a vent, the lowest part alsobeing on the exterior of the tank and provided with a combined drain andlow regulating device, and means for securing said end couplings to saidtank provided with sleeves adapted for `"making -independent joints withsaid coil and with the tank wall.

6. In casings for oil insulated transformers and the like, thelcombination with a wall having openings therein, of a cooling coiladapted to convey a Huid for cooling the oil and provided with endcouplings arranged to protrude through Athe openings in said wall,` andmeans for securin said coupling ends to said tank provider? with sleevesadlipted for making fluid tight engagement with said coil ends and forholding the same in fluid tight engagement over the tank wall openings.

7. In casings for transformers' and the like, the combination with awall, of a cooling coil provided with end couplings adapted to protrudethrough said wall, the exterior parts of said coil being maderespectively the highest and lowest parts thereof, the highest partbeing provided with a vent, the lowest part being provided with a drain,and means associated with said end couplings for securing said coil tosaid tank comprising sleeves secured in fluid tight engagement on theprotruding portions of said end couplings and adapted to be secured influid tight engagement over the tank wall openings.

In witness whereof, I have hereunto set my hand this 20th da of August,1919.

MAT HEW L. ELDER.

